Analysis of precipitation and drought trends by a modified Mann–Kendall method: a case study of Lorestan province, Iran

Abstract In this study, to evaluate the trend of precipitation change, Mann–Kendall method has been used. The studied area is Lorestan province located in western part Iran. To achieve goal, time series annual and monthly rainfall data were collected for different statistical periods. Moreover, order analyze drought, standard index non-parametric test predict meteorological drought province, parameter was incorporated. results showed that most parts are facing an extreme such conditions will happen again future. Furthermore, amount predicted until 2032, entire there a significant months. research on scale all stations have negative at level 5%, which indicates existence trend, or other words, decrease irrigation stations. Therefore, according obtained results, it necessary plan water consumption toward sustainable management.